Machine for spray coating hollow articles



Nov. 29, 1949 J. H. FRlDE N EI'AL 2,489,371

MACHINE FOR SPRAY COATING HOLLOW ARTICLES Filed March 29, 1945 6Sheets-Sheet 1 OOOO A) EN TORS A! F2925? AMA 13950197 Nov. 29, 1949 J.H. FRIDEN ETAL 2,489,371

MACHINE FOR SPRAY COATING HOLLOW ARTICLES Filed March 29, 1945 6Sheets-Sheet 2 INVENTORS (75H H/V-WDE/V BY M44 lA WA A3950?- XZ C.

Nov. 29, 1949 J. H. FRIDEN EFAL 2,489,371

MACHINE FOR SPRAY COATING HOLLOW ARTICLES Filed March 29, 1945 sSheets-Sheet a Ndv. 29, 1949 J. H. FRIDEN ET-AL.

- MACHINE FOR SPRAY COATIN G HOLLOW ARTICLES 6 Sheets-'Sheet 4 FiledMarch 29, 1945 BY MAL/AMA Jams-car Nov. 29, 1949 J. H. FRIDEN ETAL2,489,371

I MACHINE FOR SPRAY COATING- HOLLOW ARTICLES Filed March 29, 1945 sSheets-Sheet 5 INVEN TOR; Jamv /7 FTQ/DEA/ BY M4 MM A AB/PEcv/r AT .T0511 5) Nov. 29, 1949 J. H. FRIDEN El'AL 2,489,371

MACHINE FOR SPRAY COATING HOLLOW ARTICLES Filed March 29, 1945' 6Sheets-Sheet 6 ATTaEA/EY Patented Nov. 29, 1949 MACHINE FOR SPRAYCOATING HOLLOW ARTICLES John H. Fridn, Maplewood, and William A.Abrecht, Union, N. J., assignors to The Sun Tube Corporation, Hillside,N. J., a corporation of New Jersey Application March 29, 1945, SerialNo. 585,520

15 Claims.

This invention relates to a coating machine and more particularly to amachine, mechanisms, and a system of apparatus for coating the interiorof tubular bodies.

It is highly desirable and in many cases essential that the innersurface of various tubular bodies be coated with a film of requisitethickness of a suitable substance to prevent undesirable reactions fromtaking place between the tubular body and compositions that may bedeposited therein. For example, many present day tubes for containingmedicaments, tooth paste, shaving cream, and the like are made of alloyscontaining lead. Unless a suitable liner or coatin of a protective filmbe placed between the inner wall of the tube and the substance storedtherein, there is a danger of objectionable reactions taking placebetween the substance in the tube and the material of the tube itself.

This invention is concerned primarily with an arrangement of mechanismsand devices for quickly and effectively coating the inner surface oftubes, such as those mentioned above. To this end the instant inventionincludes a mechanism in the nature of a turntable comprising a base thatis rotatable about 'an upright hollow shaft. A plurality of spacedupright hollow arms are carried by the base and arranged equidistantfrom the axis thereof. The rotary mechanism includes a series ofpassages each of which communicates with the interior of a correspondinghollow arm and is adapted to communicate with the interior of the hollowshaft during a portion of each complete revolution of the base about theshaft. A suitable coating material is supplied to the hollow shaft in aliquid state and flows into each arm during a correspondingpredetermined portion of each revolution of the base. The upper end ofeach hollow arm is provided with a plurality of spaced passagesestablishing communication between the interior and exterior thereof andpreferably arranged in a manner to jet the fluid material at an acuteangle upwardly and laterally of corresponding radii of each arm. Eacharm is adapted to receive a tubular body in the manner that the fluidjetted by way of the passages therein is sprayed against the inner wallof the tubes. The arrangement of these passages is such that the fluidmaterial jetted therethrough tends to raise each tube slightly above theupper end of its carrying hollow arm and impart a rotary motion to eachtube during the spraying operation. This insures complete coating of theinside of each tube.

From the rotary mechanism above discussed the tubes are placed onsuitable supports mounted on an endless conveyor that is movable in atortuous path through an oven or housing. The housing is divided by aperforate partition into an upper and a lower compartment, the path ofmovement of the endless conveyor and the tubes carried thereby being inthe lower compartment. A blower transmits a continuous stream of aheated gaseous medium, such as air, into the upper compartment. Theheated gas passes downwardly through the perforate partition and heatsthe lower compartment, maintaining the tubes at a temperature above themelting point of the coating material. off the individual tubes and iscollected in a sump provided in the bottom of the oven. A pumphaving ascreened inlet is employed to transmit the thus collected coatingmaterial while still in liquid state to the exterior of the housing forreuse or disposal as desired.

The tortuous path of the endless conveyor through the housing and thetime required for any portion of the belt to pass through the housingare such that upon emergence of individual tubes from the housing,excess coating material will have drained off leaving a relatively thinfilm of the same on the inner surface of each tube. A blast of coolingair may be used to cool the tubes after they leave the housing, ifdesired.

It is an object of this invention to provide mechanisms and devices forreadily coating the interior of tubular bodies.

Another object of the invention is to provide a system for placing arelatively thin film of at suitable coating material on the internalsurface of a tubular body.

A further object of the invention resides in coating the interior oftubular bodies with a suitable material on a mass production basis.

This invention has for a still further object the provision of apparatusof the character indicated that is simple in design, rugged inconstruction, and is capable of performing its intended functions in atrouble-free manner.

With the above and other objects in View, the

invention comprises the devices, combinations,

and arrangement of parts set forth in the following detailed descriptionand illustrated in the annexed drawings of a preferred embodiment of theinvention, from which the several features of the invention, togetherwith the advantages attainable thereby will be readily understood by'persons skilled in the art.

In the drawings:

-Figure 1 is a plan view of an arrangement of Excess coating materialdrains- 3 4 devices and mechanisms embodying this invendesiredtemperature and is then introduced into tion, partly in horizontal crosssection and with blower 2'! through inlets 29 and discharged by partsbroken away for better illustration; way of blower outlet 38 into uppercompartment Figure 2 is a view in vertical longitudinal sec- 24. Fromupper compartment 24 the heated air tion of the apparatus ofthislinventionhtakens passes throughperjorate, partition-22 into loweralong line 2'2 of Figure 1; compartment 2% for the purpose oi?maintaining Figure 3 is a vertical transverse sectional view tubularbodies, which will be discussed further taken along line 33 of Figurealong, at a predetermined elevated temperature. Figure 4 is an enlargedtransverse sectional An endless belt or the like 45 (Figure 1) carviewtaken along line of F ur );rriesialserieslofrequally spaced upstandingpins 41. Figure 5 is an enlarged fragmentary View offal, Each pin isadapted to receive and support a Portion of g e 1, p y n ho izontalcross sectubular body 48, such as a collapsible ointment tion for betterillustration; tube that is to ,be internally coated with a suit- Fi ur 6s a top p w mar ementora able material, b tl e devices of thisinvention. tube supporting member; Belt 46 may passdownwardly through anopen- Figure 7 is a central cross sectional view taken ing 49 in th floin th cours of it movement along line 7 l of Figure 6; and. be qlej'bllllflfi-i through a similar opening (not F u 8 s an enlarged P pe eView O a shown), The tubular bodies 28 may be placed on Cylindricalpositioning member that is locatedpins'fl at a convenient locationbefore they substantially coaxial with and adjacent to the reach thhousing tube supporting member of Figuresfi and 7:; The; apparatustotthis; invention embodies; at

Fig ire -Q is a horizontal cross sectional view-- leastionerotaryrnechani smor turntable device 58'' taken along line 9-9 of Figure 8;for spraying acoat-ing of asuitable material ina Figure lo is an enlarge0p,-p1an View. of at; fluid state, such as a liquid wax intoindividualyhollowrm-d pic d in u e -3 and i ;.tubu1ar bodiesflfii- Two suchrotarymechanisms F su across sectionaleview aken al e are generallyindicatedin Figure land illustrated; staggeredllinenlh-ll of Figure 10.in; detailainrffiguresfi; 4, and 5. Eachrotary Referring now. to the,drawings. wherein-like mechanis n l a o ar ub ta t r ef rence charactersdenote correspondin p -N upright hollow shaft 5] -secu fed;to a1cover-plate,- throughoutltheseveralviews,- and more pailtlcu lao;Sloverflished pan is i 4) An insert 53, 1 411 in ur s-i 1, G e a e sra ed islocated in the low portion of the hollow oishaftthereina-housingpr.oven 'llllconsisting of a front, 5l,-and--;isprovided with a blind passage Fad-that sidewa l- L airear sidewall l2, adzend wa11sll3', communicates withaconduit 55, which, in turn, and l l,altop wall. I5, andabottoin Wall, in the; communicates witha'supplyofthe liquid waxlorriatureoflaadishedipan, l6. It:Wfl1 beobserved,35;othercoatin material;(notshown). Concenthatbottom wall lfiiisinclined andqformed so as," trio with; shafts-1 a d; th y f b a pairibt n at a e u 11 Also .bott mwall; (ii-sleeve members ;56-and sl'is aretar liubts. lfi extenciseforwardly of .frontv wall; I I and rear- Alsoconcentric with sfnaftji and rotatable about wa d y f e l A518 ep fi ies f the axis thereof is a sprocket wheel 59. A base-0L, 1 and 3, thehousin -1 lBH is assembled into a. turntable 6G issecuredto th lower;end of hub unita y tructure .by' means otvariousanglean M ier-rotationtherewith.-- Base is formed hann a andflis maintained in d i with aseries r radial passages ct, Awplurality' vated-no i ny. 93 of end ppo rof spaced upstanding hollow arms this arranged: Hi?- and= 9= A "verticalepartition-jlfl that equidistant from the axisof rotation of hub 53; atc e m wallltservesto define a a The-lowerend of each arm 52 extends intobase ji a fi o partmentil within housing 10. 60,,is-secured to thebase-by a screwplug 33;- and Oii fl f partition ecured to anglcommunicates witha; corresponding radial pasr ns 3 (Figures 2 anddivides t e remainder sage (ii-through; an aperture at. A series .ofraof the interior ofthe housing into an upper comdial passages: 65extend through hub 58- and pertin 24 nd a l we r c nv y roomparti'-SlB,8Ve 5t. Stationaryshaft 5! is provided with merit- 25.- aportefifii that-communicates with passage 54 in D sp d across endcompartment 2| s insert 53..tlirei g a duct S's". As will beobservedclinedheating unit sucheasa-steam-rediatorZfi, frqmlainamination ,goi Figures 4 and 5, fluid through vwhichrsteamatpredetermined pressure creating material u q by d t tr n iscirculated-indie.- usual manner. Positioned ssgmitted by; passage 54;duct 62?; port and pas-M within end compartment iii'aloove steam radiageeach radial passage, 61; and thence tor- 25 isalblowerl'l,thatincludesablowercasing through a ertures ts; into corresponding hollow ZBhaV-ingapair. of airiinlets 29,311 l 0111718?) arms; during; apredetermined portion of each communic ting With-upper- COIIIPaItmBHt-M;complete; revolution of base 69.1 With the arl a pair of blower-rotorsilcarried on ahorizontal to n ent illustrated the fi f t coating driveshaft; 32. Blower drive shaft 32 extendsmaterial into each tubulaiyarmis preventeddur-- through the front and rear side walls-of the housingthremaining; portion of each complete revoei n s o a h supp e in? r s 3, alutionofthe base, The upperend oi -each hollow 34 mount-ed n lebracketfifithat'ale arm- 62 is closed but is provided with a plurality attachedtofrontancl-rearwal1s H and l2 re- GaLof spaced pa ssa ge 35;.saarranged aim (meat, spectively A-pulleyBlis-affixed-to and rotatablecoating material atan acute angle up and with the lrear endpf blowershaft 32lfor impartlaterally of corresponding radii of sash arm, asing-g rotation to the. blower shaft through the coh in Eigures 10 andll. In other words, the action or an open -;V-belt 38 and a drive-pulley-39; liquid coati mat rial is jetted through passages c r di h fi ielectric motorrfl- ?Q; 10in amanner that-asa resultithereof the, jettedrp o tes o m m n-l r fiuigl -tendsto raise each-tubularhody 48 slightly:tQgl-OWBIT: compartment 25 through openings; 42; a .l ;;1; e its arm'62; and; imultaneously impart a and 43 in front wall H and throughopenings fil twirling or rotary;moye rnent;thereto, This rel-l and 45 inrear wall 12. This air-oncoming in sults in a thorough sprayingand-coating of thecontacti-withisteam radiator 26is heatedto'the'lfilinner sprfacebi each-,tubular body 3.

Disposed above base '60 is a'support H that is secured to the upper endof hub 58 and rotatable therewith. Pivotally connected to support II bymeans of pins I2 is a plurality of generally L- shaped levers I3angularly spaced from each other and corresponding in number to thenumber of hollow arms 62. A hood I4 is fastened to each lever 13 bymeans of a strap I5 and screw I6. Each lever I3 also carries a hook-likeelement 1! for engaging a single helical spring I8 that is joined at itsends (not shown) to form a ring. Spring I8 is always in tension andtends to urge each lever I3 upwardly with respect to support II aboutits pivot end I2. A circular plate I9 is secured to the upper end ofstationary shaft 5| and is provided with an integral depending cammember 80 which urges and maintains each lever I3 downwardly about itspivot pin I2 during a predetermined portion of each complete revolutionof hub 58. And is best shown in Figure 4, cam member 80 permits springI8 to maintain hood I4 at the left in raised position, that is to say,away from the upper end hollow arm 62. Cam member 80 simultaneouslymaintains hood 'I4'at the right in a position over the upper end ofhollow arm 62 and tubular body 48 against the action of spring I8. Inother words cam member 80 urges and maintains each hood I4 over itscorresponding hollow arm 62 during a predetermined portion of eachcomplete revolution of base 60 against the action of spring I8 andpermits spring I8 to move each hood I4 away from the upper end of eacharm 62 during the remainder of each complete revolution of the base. Cammember 80 is so constructed and arranged as to urge and maintain eachhood I4 over its corresponding arm for at least the portion of eachcomplete revolution of the base that the coating material is flowingupwardly through the arm and discharge passages I thereof. It isrecommended that the design of cam member 80, lever I3, and hood I4 besuch that the hood is spaced from tubular body 48 when it is in positionover the tubular body, as shown at the right in Figure 4. This permitsthe fluid jetted through passages !0 to raise the tubular body andimpart rotary movement thereto as indicated above.

Disposed within hollow shaft is an electrical heating cartridge 8|having a pair of electric leads 82 for connection to a suitable sourceof electricity (not shown).

Base 60 is normally and yieldingly coupled to sprocket wheels 59 by aspring detent arrangement 65 consisting of a section of vertical tubing86 that carries a compression spring 81, which bears at its lower endagansit an adjusting screw plug 89 and at its upper end against a steelball 88 for urging the ball into a recess or notch 90 in the under sideof base 60.

An endless chain conveyor 9| is moved through lower compartment ofhousing I9 along the tortuous path indicated by the arrows by means of aseries of sprocket wheels 92 and 93. An elec-- tric motor 94 (Figure 3)drives endless conveyor 9| and rotary mechanisms 50 through suitabledevices that will now be described. These devices include a verticalshaft 95 that is actuated by motor 94 through sprocket wheels 96 and 91and a chain drive 98. Shaft 95 extends through an opening 99 in top wallI5 and has its lower end disposed in a bearing I00. One of the sprocketwheels 93 is afl'ixed to the lower end portion of shaft 95 (Figure 2)and serves to actuate endless conveyor 9| upon rotation of shaft 95. Theremaining sprocket wheels. 93,. as well as sprocket wheels 92, arerotatably supported in any desired manner on stub shafts I0 I. Asprocket pinion I02: is afiixed to each sprocket wheel 92, by welding:

or the like, for rotation therewith, and drives the correspondingsprocket wheel 59 through a chain in rotary mechanism 50 are placed overand adapted to be supported along their lower edges by supports I04.Radial slots I05 and I06 prevent the formation of beads of coatingmaterial on the interior of tubular bodies 48 as they serve to drainexcess of the coating material by capil-. lary action. A hollowcylindrical guard I01 (Fig-r ures 8 and 9), flared at its upper end, isdisposed concentric with and spaced from each support I 04 and ismaintained in this position by legs I08 that are soldered or otherwiseattached to endless conveyor 9|. Each guard I0! is provided with anumber of indentations or teats I09 which contact the outer surface oftubular bodies 48 should any of them tend to topple over in the courseof their passage through housing I0.

During the operation of the above described devices, an operator standsin front of each rotary mechanism 50 and as endless belt passes byremoves uncoated tubular bodies 48 from pins 41'- and places them overthe upper end of hollow arms 62. With the apparatus arranged, as illus-.

trated and described, rotary mechanisms 50 will rotate in a clockwisedirection as viewed in Figthe course of rotation of mechanism 50 aquantity of the coating material, for example, waxin a liquid state, issprayed into each tubular body 48 during a predetermined portion of eachcomplete revolution of the base 60. Simultaneous with the injection ofthe liquid wax into an individual tubular body, the corresponding hoodI4 will be positioned thereover. tubular bodies from being forcedupwardly and oif their arms during the coating operation. Additionally,should the operator fail to place a tubular body on one of the arms, thecorresponding hood will be placed over the upper end of the arm and thusconfine the sprayed wax, prevent the wax from being deposited on theexterior of adjacent tubes, and eliminate the possibility of injury tothe operator. After the liquid wax is sprayed into a tubular body, theoperator removes it from its supporting arm with his right hand andplaces it on a support I04 carried by an adjacent portion of endlessconveyor 9|. The conveyor then passes through lower compartment 25 wherethe heated air supplied through blower 21. maintains the wax above itsmelting point to insure excess being drained off by gravity and throughthe capillary action afforded by slots I05 and I06. As the endless beltemerges through the rear wall of housing I0 another operator removeseach tubular body.

Hoods I4 prevent aeconcluit; I IE- to a :strainer 1" l l whichi includesa; cylindrical screen; i I [8. Strainer H i attached to; -the lower endof a rod H9 that is slidable through an. opening i-2il' inaremovableclosure ir'l'l and that carriesan operating handle. i22gat itsupper end to permit of, its-,.'ready insertion and removalasrequired:through ail-opening.- I23 inyperforate partition 22;;Connected-to rotary pump ,1 i5 is a: combined hollow; drive, shaft anddischarge conduit that'is actuated: bypagmoton 1,25 The liquid wax, thatcollectsain sump-J'lqis transmittedupwardly-by pump H5 and throughconduit H24 from whenceit may. be returned; to thdsource of supply ofliquid wax,,or;disposed ctr-as desired.

An exhaust pipe- I28 having a butterfly type Qfiaicontrol valve I29, iscarried-.by-housing top wall; [5 Also, a hood I3 0-is; disposed over theportion of endless conveyors! that, is exterion the-rear wall l2, Thishood has a fiuel 3-1 for remeving undesirable fumes:v that maybeevolved,

When themachine of our invention isoutgof, service-forany considerableperiod, of time, the devices embodying rotarymechanism 5i tend to cool,and the wax therein may become hardened. Electrical heating cartridge Siserves to; supply heat to the various partsof; rotary mechanism Ellwhich are preferably metallic and thereby; melt any wax that may havebecome solidified therein prior to placing the, machine in serviceagain, 7

From the foregoing, it is believed that the COD: struction,- operationand advantages of our .pres.-, ent invention will be readilycomprehended"by: persons skilled in the art. It is to be clearly understood,however, that various changes in theapparatus set forth above may bemadeiwithout departingfrom the scope of the invention, it:

being intended that all matter contained in the description, or shown inthe drawings shall be interpreted as, illustrative only and not in: alim iting sense.

We claim: -1. In apparatus of the character described, a

stationary substantially upright hollow shaft, 2.

base rotatable about the axis of said shaft, means for impartingrotation to said-base, a plurality: of spaced upstanding hollow armscarried by said base and disposed substantially equidistant from theaxisof saidshaft, and means communicating with the interior of said shaftfor selectively and successively transmitting iiuid material into theinterior of each of said arms during a correspondingpredeterminedportion of each complete revolution of said base about said shaft, eachof said-arms having a plurality of'passages establishing communicationbetween the interior and ex terior thereof and extending in a directiongenerally upward and at an acute angle to corre-- sponding radii of saidarms.

. 2. In apparatus of the character described, a stationary substantiallyupright shaft, a base rotatable about the axis of said shaft, means forimparting rotation to said base, a plurality of spaced upstanding hollowarms carried by said base and disposed substantially equidistant fromtheaxis of said shaft, and means for selectively and successivelytransmitting fluid material into the interior of each of said armsduring a corresponding predetermined portion of each complete revolutionof said base about said shaft, said last mentioned means comprising apassag in said shaft, a plurality of passages in said base, each of;said plurality of passages in said base com- Jul municating with the.interiorsota-correspon'ding arm, and, I means for V successivelyplacing said passage in said shaftqincandoutwof fluid com: municationwith each: of ,said passages in said base during correspondingportionsof-eachcomn plete revolution of: saidgbase.

3. In appara-tus of the character described; a stationary substantiallyupnightxshaft; abase rotatable about. the-axis oisaidfshaft, means forimparting rotationto said base, a plurality; of spacedupstandinghollowaarms. carried by said base and disposedsubstantiallyequidistant from the; axis of said shaft, and meanscfor,selectively and successively transmittingfiuid material into theinterior of: each;:of vsa-idsarlms;duri a 0 1- responding predetermined;portion of each complete revolution of: said; base about'saidzshaft;said last mentionedmeans comprising a passage in said shaft, a pluralityoftpassages in-saidbase, each ofsaid-pluralityof; passages in, said-basecommunicating withitheyintcrior of acorresponde ing -arm,; and means forsuccessively placing said passage insaid shaft-,1 in and: out of;fluidcom: munication with-each of said passages in said baseduringcorrespondingportions of each complete revolution of saidabaseeachof said arms having a pluralityof ports =for discharging fluidmaterial admitted thereto; by said second mentioned means.

4. In apparatus of the;- character descr-ibecha stationary substantiallyupright shaft, a base rotatable about the axis ofvsaid shaft; means forimparting rotation, to said base, a plurality of spaced upstanding;hollowarms carried by said base anddisposed substantiallyequidistantfrom the axis of said shaft, and/means for selectively and successivelytransmitting fluid-material into the interior of, eachlof saidr-armsduring acorre-. sponding predetermined; portion. of each completerevolution of said-base about said shaft, said last mentioned meanscomprisinga passage in said shaft, a plurality .of passages in: saidbase, each of said plurality of passagesinisaid base communis. eatingwith the interior ofsa corresponding arm, and means forsuccessiyelyeplacing said passage in, said; shaft inand:-outof -1-fiuid;communication with each of said passages in-' saids base duringcorrespondin portions of each complete revolution of said base, eachlofsaid -armshaving a plus. rality ofports for-discharging-fiuid material"admitted thereto by said second mentioned means, said-portshavingtheirouter ends spaced peripherallyand being formed in a mannertodischargesaid fluid material atyan acute-angle upwardly and laterallyofcorresponding radii of' saidarm.

5. Inapparatus of-the. character'described; an upright hollow shaft, arotary-base rotatable about the axis-ofsaid shaft, a plurality of'spaced'upstanding hollow arms carrieduby said base and (ill disposedsubstantially equidistant from the axis 65, of said arms into and out ofcommunication with the interior of said hollow'shaft during acorresponding predetermined portion of each complete revolution of saidbase,-rotary-driving means, and means normally and yieldinglycouplingsaid driv- 7;; ing means to said base;

6; In apparatus of' the character described; anupright hollow shaft, arotary base=rotatableabout the axis oi said shaft, a plurality. ofspaced upstanding hollow-arms carried'eby said-base and- La;disposed;substantially equidistant from the axls of rotation thereof, aplurality of discharge ports in each arm establishing communicationbetween the interior and the exterior thereof, means selectively andsuccessively placing the interior of each of said arms into and out ofcommunication with the interior of said hollow shaft during acorresponding predetermined portion of each complete revolution of saidbase, rotary driving means, and means comprising a spring-pressed detentfor normally and yieldingly coupling said driving means to said base.

7. In apparatus of the character described, a rotary base, a pluralityof spaced upstanding hollow arms carried by and rotatable with saidbase, means for selectively transmitting fluid material into theinterior of each of said arms during a corresponding predeterminedportion of each complete revolution of said base, support meansassociated with and extending upwardly of said base, a hood adjacenteach of said arms and pivotally connected to said support means, meanscomprising a single spring for normally and yieldingly urging each hoodabout its pivotal connection with said support means in a manner to movethe same away from its correspondingarm during a predetermined portionof each complete revolution of said base, and means for urging each hoodover the upper part of its corresponding arm against the action of saidthird mentioned means during the remainder of each complete revolutionof said base.

8. In apparatus of the character described, a rotary base, a pluralityof spaced upstanding hollow arms carried by and rotatable with saidbase, means for selectively transmitting fluid material into theinterior of each of said arms during a corresponding predeterminedportion of each complete revolution of said base, support meansassociated with and extending upwardly of said base, a hood adjacenteach of said arms and pivotally connected to said support means, meanscomprising a single spring for normally and yieldingly urging each hoodabout its pivotal connection with said support means in a manner to movethe same away from its corresponding arm during a predetermined portionof each complete revolution of said base, and means comprising a singlecam for urging each hood over the upper part of its corresponding armagainst the action of said third mentioned means during the remainder ofeach complete revolution of said base.

9. In apparatus of the character described, a substantially uprightshaft, a base rotatableabout the axis of said shaft, means for impartingrotation to said base, a plurality of spaced upstanding hollow armscarried by said base and rotatable therewith, means for selectivelytransmitting fluid material into the interior of each of said armsduring a coresponding predetermined portion of each complete revolutionof said base, each of said arms having a plurality of passages in itsupper part for discharging fluid material admitted thereto by said lastmentioned means, support means secured to and rotatable with said base,a hood having an open end adjacent each of said arms, and means forpositioning and maintaining each hood over the upper part of itscorresponding arm so that the open end thereof extends below said upperpart of its corresponding arm during a predetermined portion of eachcomplete revolution of said base and for moving each hood away from theupper part of its corresponding arm during the remainder of eachcomplete revolution of said base.

10. In apparatus of the character described, a stationary substantiallyupright shaft, a base rotatable about the axis of said shaft, means forimparting rotation to said base, a plurality of spaced upstanding hollowarms carried by said base and disposed substantially equidistant fromthe axis of said shaft, means for selectively and successivelytransmitting fluid material into the interior of each of said armsduring a corresponding predetermined portion of each complete revolutionof said base about said shaft, said last mentioned means comprising apassage in said shaft, a plurality of passages in said base, each ofsaid plurality of passages in said base communicating with the interiorof a corresponding arm, and means for successively placing said passagein said shaft in and out of fluid communication with each of saidpassages in said base during corresponding portions of each completerevolution of said base, each of said arms having a plurality of portsfor discharging fluid material admitted thereto by said second mentionedmeans, support means secured to and rotatable with said base, a hoodadjacent each of said arms and pivotally connected to said supportmeans, means for urging each hood about its pivotal connection with saidsupport means in a manner to move the same away from its correspondingarm during a predetermined portion of each complete revolution of saidbase, and means for urging each hood over the upper part of itscorresponding arm during the remainder of each complete revolution ofsaid base.

11. In apparatus of the character described, a stationary substantiallyupright shaft, a base rotatable about the axis of said shaft, means forimparting rotation to said base, a plurality of spaced upstanding hollowarms carried by said base and disposed substantially equidistant fromthe axis of said shaft, means for selectively and successivelytransmitting fluid material into the interior of each of said armsduring a corresponding predetermined portion of each complete revolutionof said base about said shaft, said last mentioned means comprising apassage in said shaft, a plurality of passages in said base, each ofsaid plurality of passages in said base communicating with the interiorof a corresponding arm, and means for successively placing said passagein said shaft in and out of fluid communication with each of saidpassages in said base during corresponding portions of each completerevolution of said base, each of said arms having a plurality of portsfor discharging fluid material admitted thereto by said second mentionedmeans, a support secured to and rotatable with said base, a hoodadjacent each of said arms and pivotally connected tosaid support, meansfor normally and yieldingly urging each hood about its pivotalconnection with said support in a manner to move the same away from itscorresponding arm during a predetermined portion of each completerevolution of said base, and means for urging each hood over the upperpart of each arm against the action of said last mentioned means duringthe remainder of each complete revolution of said base.

12. In apparatus of the character described, a stationary substantiallyupright shaft, a base rotatable about the axis of said shaft, means forunparting rotation to said base, a plurality of spaced upstanding hollowarms carried by said base and disposed substantially equidistant fromarm,- and means for successively placing said pasl sage in said shaft inand out of fluid communication with each of said passages in said baseduring corresponding portions of each complete revolution of said base,each of said arms having a plurality of ports for discharging fluidmaterial admitted thereto by said second mentioned means, a supportsecured to and rotatable with said base, a hood adjacent each of saidarms and pivotally connected to said support, means for normally andyieldingly urging each hood about its pivotal connection with saidsupport in a manner to move the same away from its corresponding armduring a predetermined portion of each complete revolution of said base,and means comprising a cam for urging each hood over the upper part ofeach arm against the action of said last mentioned means during theremainder of each complete revolution of said base.

I 13. In apparatus of the character described, a

stationary substantially upright shaft, a base 39 rotatable about theaxis of said shaft, means for imparting rotation to said base, aplurality of spaced upstanding hollow arms carried by said base anddisposed substantially equidistant from the axis of said shaft, meansfor selectively and successively transmitting iiuid material into theinterior of each of said arms during a corresponding predeterminedportion of each complete revolution of said base about said shaft, saidlast mentioned means comprising a passage in said shaft, a plurality ofpassages in said base, each of said plurality of passages in said basecommunicating with the interior of a corresponding arm, and means. forsuccessively placing said passage in said shaft in and out of fluidcommunication with each of said passages in said base duringcorresponding portions of each complete revolution of said base, each ofsaid arms having a plurality of ports for discharging fluid materialadmitted thereto by said second mentioned means, a support secured toand rotatable with. said base, a hood adjacent each of said arms andpivotally connected to said support, means comprising a single springfor normally and yieldingly urging each hood about its pivotal '55connection with said support in a manner" to move the same away from itscorresponding arm during a predetermined portion of each completerevolution of said base, and means for urging each hood over the upperpart of each arm 12 against the action of said last mentioned-meansduring the remainder of each complete revolution of said base.

1 In apparatus ;of, the character described, *a stationary substantiallyupright shaft, a base rotatable about the axis of said shaft, means forimpartingrotation to, said base, a plurality of spaced upstanding hollowarms carried by said base and disposed substantially equidistant fromthe axis of said shaft, means for selectively and successivelytransmitting fluid material into the interior of each of said armsduring a corresponding predetermined portion of each complete revolutionof said base about said shaft, said last mentioned means comprising apassage in said shaft, a plurality of passages in said base, each ofsaid plurality of passages in said base communicating with the interiorof a corresponding arm, and means for successively placing said passagein said shaft in and out of fluid communication with each of saidpassages in said base during corresponding portions of eachcompleterevolution of said base, each of said arms having a pluralityofports for discharging fluid material admitted thereto by said secondmentioned means, asupport secured to and rotatable with said base, ahood adjacent each of said arms and pivotally connected'to said support,means comprising a single spring for normally and yieldingly urging eachhood about its pivotal connection with said support in a manner to movethe same away from its corresponding arm during a predetermined portionof each complete revolution of said base, and means comprising a singlecam for urging each hood over the upper part of each arm against theaction of said last-mentioned means during the remainder of eachcompleterevolution of said base.

l 5. In apparatus of the character described, an upstanding hollow armhaving a plurality of passages establishing communication between theinterior and the exterior thereof, said passages being spaced apart andextending in a direction generally upward and at an acute angle to-acorresponding radius of the arm JOHN H. FRIDEN.

WILLIAM A. ABRECHT.

REFERENCES CITED "Ihe following references are of record in the file'ofthis patent:

UNITED STATES PATENTS Number Name Date 7 2,077,378 Deren Apr. 20, 19372,221,323 Gammeter Nov. 12, 1940 2,229,631 Barker et a]. Jan. 28,19412,257,740 Goebel et al. Oct. 7,1941 2,359,838 Gladfelter et a1. Oct.'10, 1944

